What characteristic of the S strain allows it to evade the immune system of the mice?

a. They are resistant to heat.
b. The cells have a capsule.
c. They are naturally competent.
d. They are genetically engineered to be resistant to killing.


Answer: b. The cells have a capsule.

Biology & Microbiology

You might also like to view...

Kinesis is

A. a movement toward a stimulus. B. a movement away from a stimulus. C. a nondirectional movement in response to a stimulus D. the cessation of movement in response to a stimulus E. movement due to associative learning

Biology & Microbiology

It is thought by scientists that the earliest living organisms

a. originated on another planet. b. were photosynthetic. c. used carbon monoxide as a carbon source. d. used aerobic respiration. e. made use of sulfur and hydrogen gas as energy sources.

Biology & Microbiology

What is the original source of variation that natural selection can act upon?

A) Mutation B) Gene flow C) Genetic drift D) All of the above

Biology & Microbiology

Which of these microbial products is needed to produce "gasohol"?

A) citric acid B) methanol C) ethanol D) hyaluronidase E) aspartame

Biology & Microbiology